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Helpful answers
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Dec 13, 2015 5:33 AM in response to Michmich21by stedman1,Please check the article below for possible clues.
Apps can affect Mac performance, battery runtime, temperature, and fan activity - Apple Support
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Dec 13, 2015 6:05 AM in response to stedman1by Michmich21,Thanks for the answer , but I don't have any application that use a lot of cpu... Even with only safari I have at maximum 4 hours
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Dec 13, 2015 5:52 PM in response to Michmich21by ronu,I’m a novice … what does autonomy mean in this context, and specially maximum autonomy? Further, I am now considering switching from Lion to El Capitan ... should I expect slower speed or other consequences if I upgrade?